Form for concrete cisterns, sewers, and the like.



G. G. F. BOSWELL.

FORM FOR CONCRETE OISTERNS, SEWERS, AND THE LIKE.

APPLIOATION FILED NOV. 27, 1908.

Patented Mar. 15,1910.

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R w m w m E m M ii V WLoU M 0 I 3 WITNESSES A TTOR NE Y.

G. G. F. BOSWELL.

FORM FOR CONCRETE GISTERNS, SEWERS, AND THE LIKE.

APPLIUATION TILED NOV. 27, 1908.

Patented Mar. 15, 1910.

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cistern or the like.

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Specification of Letters iatent- Patented Mar. 3.5, 1119114).

Application filed November 27, 1908. Serial No. 464,638.

To all whom it may concern;

Be it known that I, Gnonon G. F. Bos- WELL, of Indianapolis; county ofMarion, and State ofIndiana, have invented a certain new and useful Formfor Concrete Cisterns, Sewers, and the Like; and I do hereby declarethat the following is a full, clear, and exact description thereof,reference being had to the accompan ing drawings, in which like figuresrefer-to .ike parts.

The object of this invention is to improve the construction of moldforms for sewers, cisterns and the like, by way of simplicity, cheapnessand ease of operatlon.

@ne feature of the-invention consists in making up the form of sections,each section consisting of a curved se ental mold plate adapted tooverlap the adi cent mold p ates at the edges thereof, and a braceconstruction for said mold plates consisting of radially extendingpivoted arms at the. lateral edges of said plates, whereby the pivotedplates, flanges 'or plates ofadjacent mold plates can be temporarilysecured together. Along with the foregoingi's the provision of a bracefrom one of said pivoted plates to the opposite side or edge of saidmold plate arranged adjustably so the brace will be adaptetii to anydegree of curvature of said mold ate.

9 Another feature of the invention consists in combining with saidmoldplate a. transversely extending bar secured to the opposite edges orsides of said mold plate and a screw or the like operating about midwayof said mold plate for bending or controlling the curvature thereof.

The full nature of this invention will be understood from theaccompanying drawin'gs and the following description and claims.

In the drawings Figure 1 is a cross section of one of the forms adaptedfor building a Fig. 2 is an elevation of what appears in Fig. 1, partbeing broken away. Fig. 3' is a section on the line 3-3 of Fig. 2 and ona larger scale. Fig. 4 is a section on the line 4-4 of Fig. 3 on a stilllarger scale. Fig. 5 is a section on the line 55 of Fig. 4, the alteredposition of parts of Figs4 and 5 being shown by dotted lines.

Fig. 6 is an elevation of one of the mold plates with its attachedparts.

The form is made up of a number of sections similar in character. Eachof these sections consists of a mold plate 10 with the edges beveled asshown or otherwise formed so the edges of adjacent plates will overlapeach other. These plates 10 may be as long as desired for formlng thecistern or sewer a Section at a time.

I Along one edge of said plate 10, as seen 1n Fig. 6, there is areinforcing strip 11 secured. This strip and the plate 10 constitutepractically one solid plate. Along one edge of said mold plate 10 thereare pivoted plates 12 lunged to pieces 13 secured upon sa1d str p 11. Inthe form shown there are three of these pivoted plates 12, pivoted so asto roject' at a right angle or any desired ange from the mold plate.Each of the plates 12 has a pair of slots 141, see Fig. 5, and a latchbar 15 centrally pivoted on pin 16, so that the ends of the latch bar maproyect partiall over the slots. The en s of the latch bar arepreferably notched, as shown in Fig. 4, having a projection 17 at oneside thereof.

Each-mold plate 10 has on the other edge thereof pivoted plates 20pivoted thereto. There are three of these in the form shown, oneopposite each pivoted plate 12, and these pivoted plates'20 havetongue-like hooks 22 extending therefrom in position to extend throughthe slots 14 and the pivoted plate 12 when the two pivoted plates 12 and20 are brought together in interlocking position, as shown in Fig. 5.The latch bar 15 'is adapted to catch under the hooks 22 'when the arms12 and 20 are interlocked. it is thus seen that when the mold plates 10are placed adjacent each other the pivoted plates 12 and 20 may bebrought against each other and interlocked, as seen in Figs. 3, 4 and 5,and thereby sa1d mold plates 10 may be secured together.

The braces for the mold plates are mounthave a screw 30 extendingcentrally through them with'nuts 31 thereon, and on each of the braces25 set screws are pivotally secured to the plate 32 that is rivetedcentrally to the mold plate 10. By turning the nuts 31 the curvature ofthe mold plate 10 ma be modified and maintained in any desire degree ofcurvature. Another brace 35 is pivoted at 36 to the end of the arm 12and it extends diagonally to the opposite edge of the mold plate 10where it is connected with the other race 25 by means of a bolt 37projectin through the slot 38 in the brace 25, where y the attachment ofthe brace 35 may be adjusted. The arrangement of these sections in asewer form is shown in'Fig. 1 there being an inner and outer mold spaceapart and the intermediate space filled with cement 40. The moldsections are removed or collapsed by merely disengaging the latch bars15, which releases the connection between the' adjacent plates so thatthe mold sections can be lifted'away.

In forming a sewer it is observed that with this construction of a moldthe interior s ace within the sewer is practically open so t at anyonecan enter it for the purpose of releasing and removing the moldsections. In making a circular sewer the mold sections would be arrangedsubstantially as shown in Fig. 1, excepting that no m-old sections wouldbe needed in the upper part of the structure on the outside.

What I claim as my invention and desire to secure by Letters Patent is:

1. A mold form for concrete cisterns, sewers and the like made up ofmold plates adapted to be laced with their edges adjacent successive y,pivoted plates on the adjacent edges of said mold plates and adapted tolie against each other, means for temporarily securing said adjacentpivoted plates together and means for changing and maintaining thecurvature of said mold plates.

I 2. A mold form for concrete cisterns, sewers and the like made up ofmold plates adapted to be placed with their edges adjacent successively,ivoted plates on the adjacent edges of saic i mold plates adapted to lieagainst each other, one of said pivoted plates being provided withslots, and a latch ar pivote on said pivoted plate, the other adjacentpivoted plate being provided with hooks adapted to extend through saidsl and be engaged by said latch bar for temporarily holding the ivotedplates together.

3. A mold form 'or concrete cisterns, sewers and the like made up ofmold plates adapted to be laced with their edges adjacent successive y,pivoted plates on the adj acent edges of said mold plates adapted to lieagainst each other, means for temporarily securing said adjacent pivotedplates together, and means for changing and maintalning the curvature ofsaid mold plates and braces extending from one side or edge of each moldplate to the ends of said pivoted plates at the other side of the samemold plate.

4. A mold form for concrete cisterns, sewers and the like made up ofmold plates adapted to be placed with their edges adjacent successively,pivoted plates on the adjacent edges of said mold plates adapted to lieagainst each other, means for temporarily securing said adjacent pivotedJlates together, braces extending transverse y of each mold plate andbetween said pivoted plates, and a screw mounted about midway of saidbraces that is adapted to press the mold plate and press the bracesapart.

5. A mold form for concrete cisterns, sewers and the like made up ofmold plates adapted to be placed with their edges adjacent successively,pivoted plates on the adjacent edges of said mold plates adapted to lieagainst each other, means for temporarily securing said adjacent pivotedlates together, braces extending transverse y of each plate and betweensald pivoted plates, screws pivotally connected with the mold plateabout midway thereof that project through the braces, and nutsthereonwhereby the mold plate and braces may be pressed apart and maintained intheir adjusted positions.

In testimony whereof, I have hereunto at fixed my signature in thepresence of the witnesses herein named.

GEORGE G. F; BOSWELL.

Witnesses:

O. M. GREENER, 0. M. MOLAUGHLIN.

